vi_controller.v
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/************************************************************************\
| |
| Copyright (C) 1994, Silicon Graphics, Inc. |
| |
| These coded instructions, statements, and computer programs contain |
| unpublished proprietary information of Silicon Graphics, Inc., and |
| are protected by Federal copyright law. They may not be disclosed |
| to third parties or cosied or duplicated in any form, in whole or |
| in part, without the prior written consent of Silicon Graphics, Inc. |
| |
\************************************************************************/
// $Id: vi_controller.v,v 1.1.1.1 2002/05/17 06:07:49 blythe Exp $
////////////////////////////////////////////////////////////////////////
//
// Project Reality
//
// module: vi_controller
// description: DMA request FSM for video interface.
//
// designer: Phil Gossett
// date: 1/3/95
//
////////////////////////////////////////////////////////////////////////
module vi_controller(clk, reset_l,
dma_grant, dma_start, dma_last,
reg_write_data, reg_address, reg_write_enable, v_current,
block_address, block_length, block_word, bank_sel,
block_start, block_count, read_addr, pre_int,
horizontal_flag, di, dout_a, dout_b,
block_partial, wen_a, wen_b, addr_a, addr_b, do,
dma_address, dma_length, dma_request, block_grant, reg_read_data,
vbus_clock_enable_l, ctrl, origin, width, v_int,
hsync_width, burst_width, vsync_width, burst_start,
v_sync_period, h_sync_period, leap_pattern,
hsync_leap_b, hsync_leap_a, h_video_end, h_video_start,
v_video_end, v_video_start, v_burst_end, v_burst_start,
x_scale, y_scale, x_offset, y_offset, vi_int, refresh_strobe);
`include "vi.vh"
input clk; // system clock
input reset_l; // system reset_l
input dma_grant; // grant the DMA operation
input dma_start; // start the DMA operation
input dma_last; // end the DMA operation
input [CBUS_DATA_SIZE-1:0] reg_write_data; // register write data from cbus
input [VI_REG_ADDRESS_SIZE-1:0] reg_address; // register read/write address
input reg_write_enable; // register write enable
input [9:0] v_current; // lines read only reg
input [DRAM_ADDRESS_SIZE-1:0] block_address;
input [DMA_LENGTH_SIZE-1:0] block_length;
input [3:0] block_word; // location in span buffers
input bank_sel; // buffer bank select
input block_start; // treat as consecutive req's
input [1:0] block_count; // number of consec req's - 1
input [3:0] read_addr; // buffer read address
input pre_int; // for synchronization
input horizontal_flag; // for refresh strobe
input [EBUS_DATA_SIZE+DBUS_DATA_SIZE-1:0] di;
input [EBUS_DATA_SIZE+DBUS_DATA_SIZE-1:0] dout_a;
input [EBUS_DATA_SIZE+DBUS_DATA_SIZE-1:0] dout_b;
output block_partial; // some partially covered
output wen_a; // buffer write enable
output wen_b; // buffer write enable
output [3:0] addr_a;
output [3:0] addr_b;
output [EBUS_DATA_SIZE+DBUS_DATA_SIZE-1:0] do;
output [DRAM_ADDRESS_SIZE-1:0] dma_address;
output [DMA_LENGTH_SIZE-1:0] dma_length;
output dma_request; // request a DMA read cycle
output block_grant;
output [CBUS_DATA_SIZE-1:0] reg_read_data; // read data to cbus
output vbus_clock_enable_l;
output [15:0] ctrl; // bits
output [23:0] origin; // bytes
output [11:0] width; // pixels
output [9:0] v_int; // half lines
output [7:0] hsync_width; // pixels
output [7:0] burst_width; // pixels
output [3:0] vsync_width; // pixels
output [9:0] burst_start; // pixels
output [9:0] v_sync_period; // half lines
output [11:0] h_sync_period; // clocks
output [4:0] leap_pattern; // fields
output [11:0] hsync_leap_b; // clocks
output [11:0] hsync_leap_a; // clocks
output [9:0] h_video_end; // pixels
output [9:0] h_video_start; // pixels
output [9:0] v_video_end; // half lines
output [9:0] v_video_start; // half lines
output [9:0] v_burst_end; // half lines
output [9:0] v_burst_start; // half lines
output [11:0] x_scale; // 2.10
output [11:0] y_scale; // 2.10
output [11:0] x_offset; // 2.10
output [11:0] y_offset; // 2.10
output vi_int; // synchronized interrupt
output refresh_strobe; // synchronized refresh request
// output registers
reg block_partial;
reg dma_request;
reg block_grant;
reg [15:0] ctrl; // bits
reg [23:0] origin; // bytes
reg [11:0] width; // pixels
reg [9:0] v_int; // half lines
reg [7:0] hsync_width; // pixels
reg [7:0] burst_width; // pixels
reg [3:0] vsync_width; // pixels
reg [9:0] burst_start; // pixels
reg [9:0] v_sync_period; // half lines
reg [11:0] h_sync_period; // clocks
reg [4:0] leap_pattern; // fields
reg [11:0] hsync_leap_b; // clocks
reg [11:0] hsync_leap_a; // clocks
reg [9:0] h_video_end; // pixels
reg [9:0] h_video_start; // pixels
reg [9:0] v_video_end; // half lines
reg [9:0] v_video_start; // half lines
reg [9:0] v_burst_end; // half lines
reg [9:0] v_burst_start; // half lines
reg [11:0] x_scale; // 2.10
reg [11:0] y_scale; // 2.10
reg [11:0] x_offset; // 2.10
reg [11:0] y_offset; // 2.10
reg vi_int;
reg refresh_strobe;
wire block_start_1d; // instanciated synchronizer delay
wire block_start_2d;
wire block_start_3d;
wire pre_int_1d;
wire pre_int_2d;
wire pre_int_3d;
wire horizontal_flag_1d;
wire horizontal_flag_2d;
wire horizontal_flag_3d;
reg refresh_strobe_0d;
reg refresh_strobe_1d;
reg refresh_strobe_2d;
reg refresh_strobe_3d;
reg refresh_strobe_4d;
reg refresh_strobe_5d;
reg block_start_4d; // for edge detectors
reg block_start_4e;
reg pre_int_4d;
reg horizontal_flag_4d;
reg dma_grant_1d; // to widen strobe for other clock domain
reg dma_start_1d; // delay line
reg dma_start_2d;
reg dma_start_3d;
reg dma_start_4d;
reg dma_last_1d;
reg dma_last_2d;
reg dma_last_3d;
reg dma_last_4d;
reg dma_last_5d;
reg [3:0] block_word_1d;
reg [3:0] block_word_2d;
reg [3:0] block_length_1d;
reg [3:0] block_length_2d;
reg [3:0] span_addr; // address for spanbuf read
reg [1:0] span_count; // number of remaining consecutive spans
reg [1:0] dma_count; // number of remaining consecutive dma's
reg [9:0] v_current_safe; // synchronized sample of current line
reg [6:0] test_addr; // spanbuf diagnostic address override
reg [EBUS_DATA_SIZE+DBUS_DATA_SIZE-1:0] staged_data; // diagnostic write data
reg pre_wen_a;
reg pre_wen_b;
reg [3:0] span_length;
reg split_last;
reg granted;
wire split;
wire [DRAM_ADDRESS_SIZE-1:0] block_end;
wire [DRAM_ADDRESS_SIZE-1:0] split_addr;
wire [3:0] paddr_a;
wire [3:0] paddr_b;
wire [CBUS_DATA_SIZE-1:0] test_data;
wire partial;
assign block_end = block_address + block_length;
assign split_addr = block_end & 24'hFFF800;
assign split = block_address[11] ^ block_end[11];
assign dma_address = (split && split_last) ? split_addr :
block_address;
assign dma_length = split ? (split_last ?
(block_end - split_addr) :
(split_addr - block_address - 1)) :
block_length;
assign partial = (!ctrl[0] && ((di[56:54] != 3'b111) || // 16 bit 5/5/5/3
(di[38:36] != 3'b111) ||
(di[20:18] != 3'b111) ||
(di[2:0] != 3'b111))) ||
( ctrl[0] && ((di[45:43] != 3'b111) || // 32 bit 8/8/8/8
(di[9:7] != 3'b111)));
assign wen_a = !ctrl[7] ? pre_wen_a : ((test_addr[1:0] == 3) &&
!test_addr[6] &&
(reg_address == 15) &&
reg_write_enable);
assign wen_b = !ctrl[7] ? pre_wen_b : ((test_addr[1:0] == 3) &&
test_addr[6] &&
(reg_address == 15) &&
reg_write_enable);
assign paddr_a = bank_sel ? read_addr : span_addr;
assign paddr_b = bank_sel ? span_addr : read_addr;
assign addr_a = !ctrl[7] ? paddr_a : test_addr[5:2];
assign addr_b = !ctrl[7] ? paddr_b : test_addr[5:2];
assign do = !ctrl[7] ? di : staged_data;
assign test_data =
!test_addr[6] ?
(!test_addr[1] ?
(!test_addr[0] ?
{dout_a[ 71: 56], dout_a[ 53: 38]} :
{dout_a[ 35: 20], dout_a[ 17: 2]} ) :
(!test_addr[0] ?
{dout_a[ 55: 54], dout_a[ 37: 36],
dout_a[ 19: 18], dout_a[ 1: 0]} :
0 )) :
(!test_addr[1] ?
(!test_addr[0] ?
{dout_b[ 71: 56], dout_b[ 53: 38]} :
{dout_b[ 35: 20], dout_b[ 17: 2]} ) :
(!test_addr[0] ?
{dout_b[ 55: 54], dout_b[ 37: 36],
dout_b[ 19: 18], dout_b[ 1: 0]} :
0 )) ;
// instanciated synchronizer flops
dfntnb bbsy1 (.cp(clk), .d(block_start), .q(block_start_1d));
dfntnb bbsy2 (.cp(clk), .d(block_start_1d), .q(block_start_2d));
dfntnb bbsy3 (.cp(clk), .d(block_start_2d), .q(block_start_3d));
dfntnb hfsy1 (.cp(clk), .d(horizontal_flag), .q(horizontal_flag_1d));
dfntnb hfsy2 (.cp(clk), .d(horizontal_flag_1d), .q(horizontal_flag_2d));
dfntnb hfsy3 (.cp(clk), .d(horizontal_flag_2d), .q(horizontal_flag_3d));
dfntnb pisy1 (.cp(clk), .d(pre_int), .q(pre_int_1d));
dfntnb pisy2 (.cp(clk), .d(pre_int_1d), .q(pre_int_2d));
dfntnb pisy3 (.cp(clk), .d(pre_int_2d), .q(pre_int_3d));
// state machine
reg [1:0] state;
parameter
STATE_IDLE = 0,
STATE_READ_REQ = 1,
STATE_READ_WAIT = 2,
STATE_READ = 3;
always @(posedge clk or negedge reset_l)
begin
if (!reset_l)
begin
// resetable registers
dma_request <= 0;
block_partial <= 0;
split_last <= 0;
granted <= 0;
pre_wen_a <= 0;
pre_wen_b <= 0;
pre_int_4d <= 0;
block_start_4d <= 0;
block_start_4e <= 0;
ctrl <= 0; // blank video (incl syncs)
hsync_width <= 8'd1; // for refresh
h_sync_period <= 12'd2047; // for refresh
v_int <= 'h3FF;
vi_int <= 0;
refresh_strobe_0d <= 0;
refresh_strobe_1d <= 0;
refresh_strobe_2d <= 0;
refresh_strobe_3d <= 0;
refresh_strobe_4d <= 0;
refresh_strobe_5d <= 0;
refresh_strobe <= 0;
state <= STATE_IDLE;
block_grant <= 0;
origin <= 0;
width <= 0;
burst_width <= 0;
vsync_width <= 0;
burst_start <= 0;
v_sync_period <= 0;
leap_pattern <= 0;
hsync_leap_b <= 0;
hsync_leap_a <= 0;
h_video_end <= 0;
h_video_start <= 0;
v_video_end <= 0;
v_video_start <= 0;
v_burst_end <= 0;
v_burst_start <= 0;
x_scale <= 0;
y_scale <= 0;
x_offset <= 0;
y_offset <= 0;
horizontal_flag_4d <= 0;
dma_grant_1d <= 0;
dma_start_1d <= 0;
dma_start_2d <= 0;
dma_start_3d <= 0;
dma_start_4d <= 0;
dma_last_1d <= 0;
dma_last_2d <= 0;
dma_last_3d <= 0;
dma_last_4d <= 0;
dma_last_5d <= 0;
block_word_1d <= 0;
block_word_2d <= 0;
block_length_1d <= 0;
block_length_2d <= 0;
span_addr <= 0;
span_count <= 0;
dma_count <= 0;
v_current_safe <= 0;
test_addr <= 0;
staged_data <= 0;
span_length <= 0;
end
else
begin
horizontal_flag_4d <= horizontal_flag_3d;
refresh_strobe_0d <= horizontal_flag_3d && !horizontal_flag_4d;
refresh_strobe_1d <= refresh_strobe_0d;
refresh_strobe_2d <= refresh_strobe_1d;
refresh_strobe_3d <= refresh_strobe_2d;
refresh_strobe_4d <= refresh_strobe_3d;
refresh_strobe_5d <= refresh_strobe_4d;
refresh_strobe <= refresh_strobe_5d;
dma_grant_1d <= dma_grant;
block_grant <= (dma_grant || dma_grant_1d) && (!split || split_last);
if (dma_grant)
begin
granted <= 1;
end
else
begin
if (dma_start)
begin
granted <= 0;
end
end
dma_start_1d <= dma_start && granted;
dma_start_2d <= dma_start_1d;
dma_start_3d <= dma_start_2d;
dma_start_4d <= dma_start_3d;
dma_last_1d <= dma_last;
dma_last_2d <= dma_last_1d;
dma_last_3d <= dma_last_2d;
dma_last_4d <= dma_last_3d;
dma_last_5d <= dma_last_4d;
case (state)
STATE_IDLE :
begin
if (block_start_3d && !block_start_4e)
begin
block_start_4e <= 1;
block_partial <= 0;
span_count <= block_count;
state <= STATE_READ_REQ;
end
else
begin
block_start_4e <= block_start_4e && block_start_3d;
end
end
STATE_READ_REQ :
begin
block_start_4e <= block_start_4e && block_start_3d;
if (dma_grant || granted)
begin
state <= STATE_READ_WAIT;
end
end
STATE_READ_WAIT :
begin
block_start_4e <= block_start_4e && block_start_3d;
if (dma_start_4d)
begin
if (!bank_sel)
begin
pre_wen_a <= !ctrl[11];
end
else
begin
pre_wen_b <= !ctrl[11];
end
span_addr <= block_word_2d;
span_length <= block_length_2d;
state <= STATE_READ;
end
end
STATE_READ :
begin
block_start_4e <= block_start_4e && block_start_3d;
span_addr <= span_addr + 1;
span_length <= span_length - 1;
if (partial)
begin
block_partial <= 1;
end
if (dma_last_5d)
begin
pre_wen_a <= 0;
pre_wen_b <= 0;
if (span_length != 0)
begin
state <= STATE_READ_WAIT;
end
else
begin
if (span_count != 0)
begin
span_count <= span_count - 1;
state <= STATE_READ_WAIT;
end
else
begin
state <= STATE_IDLE;
end
end
end
end
endcase
if (dma_grant)
begin
block_word_1d <= block_word + dma_address[6:3] - block_address[6:3];
block_length_1d <= split_last ? (block_end[6:3] - split_addr[6:3]) :
block_length[6:3];
block_start_4d <= block_start_4d && block_start_3d;
if (!split || split_last)
begin
if (dma_count != 0)
begin
dma_count <= dma_count - 1;
end
else
begin
dma_request <= 0;
end
end
end
else
begin
if (block_start_3d && !block_start_4d)
begin
block_start_4d <= 1;
dma_request <= 1;
dma_count <= block_count;
end
else
begin
block_start_4d <= block_start_4d && block_start_3d;
end
end
if (dma_grant_1d)
begin
if (split)
begin
split_last <= !split_last;
end
else
begin
split_last <= 0;
end
end
if (dma_start)
begin
block_word_2d <= block_word_1d;
block_length_2d <= block_length_1d;
end
if (refresh_strobe)
begin
v_current_safe <= v_current;
end
if (reg_write_enable && (reg_address == 4))
begin
vi_int <= 0;
end
else
begin
pre_int_4d <= pre_int_3d;
if (pre_int_3d && !pre_int_4d)
begin
vi_int <= 1;
end
end
if (reg_write_enable)
begin
case (reg_address)
0 : begin
ctrl[15:0] <= reg_write_data[15:0];
end
1 : begin
origin[23:0] <= reg_write_data[23:0];
end
2 : begin
width[11:0] <= reg_write_data[11:0];
end
3 : begin
v_int[9:0] <= reg_write_data[9:0];
end
4 : begin
end
5 : begin
burst_start[9:0] <= reg_write_data[29:20];
vsync_width[3:0] <= reg_write_data[19:16];
burst_width[7:0] <= reg_write_data[15:8];
hsync_width[7:0] <= reg_write_data[7:0];
end
6 : begin
v_sync_period[9:0] <= reg_write_data[9:0];
end
7 : begin
h_sync_period[11:0] <= reg_write_data[11:0];
leap_pattern[4:0] <= reg_write_data[20:16];
end
8 : begin
hsync_leap_b[11:0] <= reg_write_data[11:0];
hsync_leap_a[11:0] <= reg_write_data[27:16];
end
9 : begin
h_video_end[9:0] <= reg_write_data[9:0];
h_video_start[9:0] <= reg_write_data[25:16];
end
10 : begin
v_video_end[9:0] <= reg_write_data[9:0];
v_video_start[9:0] <= reg_write_data[25:16];
end
11 : begin
v_burst_end[9:0] <= reg_write_data[9:0];
v_burst_start[9:0] <= reg_write_data[25:16];
end
12 : begin
x_scale[11:0] <= reg_write_data[11:0];
x_offset[11:0] <= reg_write_data[27:16];
end
13 : begin
y_scale[11:0] <= reg_write_data[11:0];
y_offset[11:0] <= reg_write_data[27:16];
end
14: begin
test_addr <= reg_write_data[6:0];
end
15 : begin
case (test_addr[1:0])
0: begin
{staged_data[ 71: 56],
staged_data[ 53: 38]} <=
reg_write_data;
end
1: begin
{staged_data[ 35: 20],
staged_data[ 17: 2]} <=
reg_write_data;
end
2: begin
{staged_data[ 55: 54],
staged_data[ 37: 36],
staged_data[ 19: 18],
staged_data[ 1: 0]} <=
reg_write_data[7:0];
end
endcase
end
endcase
end
end
end
// register read mux
assign reg_read_data =
reg_address[3] ?
(reg_address[2] ?
(reg_address[1] ?
(reg_address[0] ?
test_data :
test_addr) :
(reg_address[0] ?
{y_offset[11:0],4'b0,
y_scale} :
{x_offset[11:0],4'b0,
x_scale[11:0]})) :
(reg_address[1] ?
(reg_address[0] ?
{v_burst_start[9:0],6'b0,
v_burst_end[9:0]} :
{v_video_start[9:0],6'b0,
v_video_end[9:0]}) :
(reg_address[0] ?
{h_video_start[9:0],6'b0,
h_video_end[9:0]} :
{hsync_leap_a[11:0],4'b0,
hsync_leap_b[11:0]}))) :
(reg_address[2] ?
(reg_address[1] ?
(reg_address[0] ?
{leap_pattern[4:0],4'b0,
h_sync_period[11:0]} :
v_sync_period) :
(reg_address[0] ?
{burst_start[9:0],
vsync_width[3:0],
burst_width[7:0],
hsync_width[7:0]} :
v_current_safe)) :
(reg_address[1] ?
(reg_address[0] ?
v_int :
width) :
(reg_address[0] ?
origin :
ctrl)));
assign vbus_clock_enable_l = ~ctrl[5];
endmodule // vi_controller.v